Manufacturing Technology Journal, 2024 (vol. 24), issue 4
Effect of Filler Content and Treatment on Mechanical Properties of Polyamide Composites Reinforced with Short Carbon Fibres Grafted with Nano-SiO₂
Dana Bakošová, Alžbeta Bakošová, Petra Dubcová, Daniela Koštialiková, Andrej Dubec, Mariana Janeková
Manufacturing Technology 2024, 24(4):521-531 | DOI: 10.21062/mft.2024.058 
The polyamide PA6 composites reinforced with carbon fibres (CF) are widely studied due to their properties and their high strength to weight ratio. Good adhesion between a filler and a matrix is es-sential for enhancing properties of a resulting composite. This study investigates the effect of the short CF content and the used CF treatment on mechanical properties of the PA6-CF composites. The composites were subjected to tensile, flexural, compression, hardness and Charpy tests as well as dynamical mechanical analysis. An atomic force microscopy was employed to investigate topography of the CF and the composites. Initially, the properties of the composites...
Modern Conversion Layers as High-Performance Alternatives to Aluminum Anodizing and Its Alloys
Martin Chvojka, Viktor Kreibich, Jan Kudláček
Manufacturing Technology 2024, 24(4):532-538 | DOI: 10.21062/mft.2024.060
The paper focuses on a novel and perspective surface treatment technology called Plasma Electrolytic Oxidation (PEO) applied to aluminium and its alloys. This innovative technology generates layers with specific properties, particularly suitable for tribological and heat-resistant applications. Plasma Electro-lytic Oxidation technology represents an alternative to conventional oxidation methods, offering high utility properties and presenting a completely new approach to surface modification.
An Investigation into Forming of Gears Using Rotary Forging Process
Ayman Ali Abd-Eltwab, Walid Elsyed Ayoub, Mohamed N. El-Sheikh, Essam Khalaf Saied, Nouby M. Ghazaly, Gomaa A. A.
Manufacturing Technology 2024, 24(4):539-551 | DOI: 10.21062/mft.2024.068
Gears and toothed parts are significant components in power transmission systems. These parts usu-ally manufactured by traditional methods such as machining by milling or forming by rotary forging. In this study, the forming of solid gears or toothed parts using a forging process that combines rotary forging and ballizing technique. The specimens were placed inside the die with excessive volume to fill the toothed part in the die. The forming tool applies pressure to the specimen while rotating it together with the die by the lathe machine chuck, while the tool advances continuously in the direc-tion of the die. This reduces height of the specimen...
Experimental Identification of Gear Mesh Stiffness and Verification by Theoretical Models
Jan Flek, Tomas Karas, Martin Dub, Frantisek Lopot, Vit Ripa, Josef Kolar
Manufacturing Technology 2024, 24(4):552-566 | DOI: 10.21062/mft.2024.069
When analyzing the natural frequencies of a gear mechanism, it's crucial to consider the mesh stiffness, which is influenced by the number of teeth in the mesh. Mesh stiffness behaves as an internal excitation source for the dynamic system, affecting the resulting frequency spectrum. This paper presents an experimental determination of gear mesh stiffness supported by analytical-simulation models of mesh stiffness, outlining common modeling methods and detailing the experimental setup and test specimens. The obtained data are then compared with simulation models of mesh stiffness, discussing the significance of this comparison and emphasizing the role...
Ultimate Response of Strengthened RC Beams in the Flexural Using Plain Cementitious Composites Layer
Ashraf M. Heniegal, Hamdy M. Afefy, Ahmed T. Baraghith, Mostafa Eldwiny, Omar Mohamed Omar Ibrahim
Manufacturing Technology 2024, 24(4):567-577 | DOI: 10.21062/mft.2024.071
This paper aims to study the efficiency of using prefabricated layers made from plain cementitious composite materials for enhancing the flexural behavior of reinforced concrete (RC) continuous beams. The strengthening system was applied at 20 mm thickness, 150 mm width, and adequate development length. The prefabricated layers were placed in the tension cover in the positive and negative zones. All beams have the same geometric dimensions and positive and negative steel reinforcement ratios. The results showed that the prefabricated layer was deformed with the RC specimen without debonding, which enhanced the cracking patterns and distributed the...
Variable Excitation Piezoelectric Energy Capture Device for Powering Scraper Conveyor Tension Detection Systems
Zhang Hezhe, Wang Cong
Manufacturing Technology 2024, 24(4):578-587 | DOI: 10.21062/mft.2024.059
Past efforts which focused on the essential monitoring of the chain tension of scraper conveyers employed in fully mechanized coal mining operations have developed innovative power solutions based on the incorporation of piezoelectric devices that generate the electrical power required for the wireless transmission of chain tension data based solely on the vibrations of the scraper conveyor itself. However, these past studies have failed to evaluate the effects of different environmental factors on the electricity generating capacity of the piezoelectric devices. The present work addresses this issue by evaluating the maximum peak-to-peak voltage generated...
Thermal – Static Analysis of the Brake Disc in SolidWorks
Daniela Koštialiková, Mariana Janeková, Petra Dubcová, Marek Hulc
Manufacturing Technology 2024, 24(4):588-593 | DOI: 10.21062/mft.2024.061
The work deals with the creation of 3D model of a disc brake of a personal vehicle, followed by a simula-tion of thermal and strengh analysis during car braking in the SolidWorks program. The disc brake is made of a gray cast iron, the most common material for this application. Cast iron discs offer excellent performance, making them suitable for various types of vehicles. The deformation of a brake disc was analyzed by using the program SolidWorks, where the first a simulation of the thermal load was per-formed, the aim of which was to determinate the temperature distribution on the brake disc and display the temperature rise during braking. In the...
The Impact of Pre-Existing Surface Texture on Laser Cladding of 316L Cladding
Chen Ma, Weilong Du, Zice Yu, Zihao Zhang, Changlong Zhao
Manufacturing Technology 2024, 24(4):594-607 | DOI: 10.21062/mft.2024.063
Laser cladding technology, a novel surface modification technique, is widely employed in tasks such as metal surface strengthening and repair. However, the quality post-cladding often falls short of usage requirements, harbouring defects like cracks and pores. In pursuit of a crack-free cladding method, surface texture technology is integrated with laser cladding technology to establish a multi-field coupled numerical simulation model. This model investigates the temperature, stress, and fluid fields during laser cladding with and without texture, aiming to identify the optimal cladding parameters. The results indicate that the optimal cladding parameters...
Mechanical Properties, Structure and Machinability of the H13 Tool Steel Produced By Material Extrusion
Martin Maly, Stepan Kolomy, Radek Kasan, Lukas Bartl, Josef Sedlak, Jan Zouhar
Manufacturing Technology 2024, 24(4):608-617 | DOI: 10.21062/mft.2024.066
The study focuses on an evaluation of mechanical properties of the H13 tool steel manufactured by the material extrusion and further comparison with conventionally produced material. Notably, for achieving sufficient surface quality of functional parts further post-processing is required. Thus, a comprehensive investigation, encompassing hardness, ultimate tensile strength (UTS) and yield strength (YS) measurement, microstructure, and machinability was performed. The material extrusion, an increasingly utilized additive manufacturing (AM) technique, offers a viable alternative to the prevalent laser powder bed fusion (LPBF) methods. This method enables...
Optimizing the Position of a Robotic Arm Using Statistical Methods
Miroslav Marcaník, Milena Kubišová, Vladimír Pata, Jana Knedlová, Oldřich Šuba, Hana Vrbová
Manufacturing Technology 2024, 24(4):618-625 | DOI: 10.21062/mft.2024.073
Robotics plays a key role in industry and its use continues to grow. Robots are used in many industries to increase efficiency, productivity, and safety of work processes. This manuscript focuses on the spatial calibration of collaborative robot arms using appropriate statistical tools. Nowadays, there are many special programming languages, simulations or virtual realities (VR), which in most cases perform calibration using matrix relations. The mathematical-statistical solution is not solved very often, and the use of linear relationships is valid only in certain parts of the workspace of the collaborative robot. The purpose of this article is to...
The Impact of Cryogenic Temperatures on the Hardness and Tribological Properties of Cobalt Alloys
Jakub Mráz, Totka Bakalova
Manufacturing Technology 2024, 24(4):626-635 | DOI: 10.21062/mft.2024.057
This article explores the effect of cryogenic temperatures on the properties of cobalt alloys, specifically Stellite 6 and Stellite 12. These alloys are commonly used in applications that require resistance to me-chanical, thermal, and chemical wear. In this study, the focus is on the valve seats for internal combus-tion engines, which are made from cobalt alloys and undergo a freezing process before assembly into the cylinder head. The purpose of freezing is to reduce the diameter of valve seats, making them easier to fit into the cylinder head. However, the length of time spent in freezing can significantly affect the hardness and tribological characteristics...
The Effect of a Mixture of Methanol and Gasoline on the Operation of an Engine in an Electric Power Generator System
Jaroslav Mrázek, Martin Pexa, Jakub Čedík
Manufacturing Technology 2024, 24(4):636-644 | DOI: 10.21062/mft.2024.070
Methanol, a type of alcohol, with gasoline, a conventional fossil fuel used in internal combustion engines. This blending process is often done to create an alternative fuel that may have certain advantages over using gasoline alone. The combination of methanol and gasoline can offer benefits such as improved combustion efficiency, reduced emissions, and potentially lower overall fuel costs. Methanol has a high-octane rating, which can enhance the combustion characteristics of the fuel mixture. This can lead to more efficient and cleaner combustion in internal combustion engines. Conducting this research is essential to explore potential improvements...
Experimental Investigation of Thermofriction’s Impact on Surface Hardness of Steel Products'
Falah Mustafa Al-Saraireh
Manufacturing Technology 2024, 24(4):645-651 | DOI: 10.21062/mft.2024.065
The impact of thermofriction on surface hardness has been investigated in this study. The metal disk method, which hardens parts' surfaces utilizing a metal disk, creates a hardened layer with the re-quired mechanical characteristics at a precise depth. The surface of treated products is one indica-tion of quality indicators. It has been noted that the thermal conductivity of the workpiece and tool material affects the irregular dispersion of heat in the processing zone. For evaluating the average integral rates of heating and cooling of the layer, the metal dependences have a significant impact on the form and properties of the friction-strengthened...
Study on Multi-Objective Optimization of Milling Process of Powder Metallurgy Titanium Aluminum Alloys
Wenbing Tian, Wenhu Wang, Yuanbin Wang, Shengguo Zhang
Manufacturing Technology 2024, 24(4):652-667 | DOI: 10.21062/mft.2024.064
Currently, there is a demand in the aerospace industry for a more effective and non-invasive milling technique for powder metallurgy γ-TiAl alloy. The primary objective of this research is to examine the surface milling process of a γ-TiAl alloy generated by powder metallurgy. The primary objective of this study is to examine the impact of process parameters on the surface roughness and cutting force of the alloy, with the aim of optimizing both surface roughness and cutting force. The response surface method was implemented to examine the milling process, and the NSGA II algorithm was employed to optimise surface roughness, cutting force,...
Navigating the Fourth Industrial Revolution: SBRI - A Comprehensive Digital Maturity Assessment Tool and Road to Industry 4.0 for Small Manufacturing Enterprises
Ludek Volf, Gejza Dohnal, Libor Beranek, Jiri Kyncl
Manufacturing Technology 2024, 24(4):668-680 | DOI: 10.21062/mft.2024.074
This article presents the development and validation of SBRI (Small Business Digital Maturity Assessment and Road to Industry 4.0), an innovative methodology for assessing digital maturity and supporting digital transformation specifically designed for small manufacturing enterprises in the context of Industry 4.0. Unlike existing models, which are often too complex or unsuitable for smaller organizations, SBRI considers the unique characteristics and constraints of small businesses. The methodology includes five key dimensions: Strategy, Technology, Process, People, and Organization, elaborated into 25 subdimensions with specific maturity criteria...
Design and Simulation of Secondary Acceleration Type Rotor for Vertical Shaft impact Crusher
Canhui Wu, Limei Zhao, Cheng Zhang
Manufacturing Technology 2024, 24(4):681-691 | DOI: 10.21062/mft.2024.072
In order to improve the crushing effect of the rotor of vertical shaft impact crusher on the particle, the design method of secondary accelerated rotor based on kinematics theory is proposed. And the operation effect of the secondary acceleration type rotor was verified using a combination of computational fluid dynamics and discrete element method (CFD-EDM). First, the kinematics of the particles thrown by the rotor throwing head was analyzed. On this basis, the structure of the secondary acceleration type rotor was designed by comprehensively considering factors such as the motion, friction, and collision recovery coefficient of particles; Then,...
Linear Motor System Identification and Simulation Experiments Based on LabVIEW
Xiaoyan Wu, Shu Wang
Manufacturing Technology 2024, 24(4):692-699 | DOI: 10.21062/mft.2024.067
There are currently many control methods for linear motors, and the focus of controlling the motor should be different for different application needs. In general applications, simple PID control can meet the application requirements, but in precision motion situations with high requirements for motion accuracy, response speed, and stability, PID control is often difficult to achieve satisfactory control results, which requires the application of more advanced control strategies to complete. At present, combining multiple control algorithms and concentrating the advantages of each algorithm while trying to overcome each other's disadvantages has become...
Microstructural Analysis, Corrosion Resistance, and Wear Performance Study of Al0.8FeCoNiCrCu0.5Si0.2 High-Entropy Alloy
Peng Zhang, Yanzhou Li
Manufacturing Technology 2024, 24(4):700-709 | DOI: 10.21062/mft.2024.062
The high-entropy alloy with the composition Al0.8FeCoNiCrCu0.5Si0.2 was produced through a pro-cess in-volving a vacuum arc melting method. Comprehensive characterization was performed through techniques such as XRD, SEM, and TEM. The findings revealed that the alloy primarily con-sists of Fe-Cr and Al-Ni phases, displaying predominantly two body-centered cubic structures. The alloy exhibited a characteristic dendritic cast structure. The alloy predominantly has high-angle grain boundaries accounting for 96.1%. Its grains demonstrate minimal internal strain and reduced lattice anomalies. The alloy showcased resistance with a corrosion current density...